The full theatrical trailer for the animated 3D film Planet 51 has appeared at Yahoo. The film is about a human astronaut (voiced by Dwayne Johnson) who lands on an alien planet, only to discover that it looks exactly like Earth. Sure, the denizens are green aliens, but otherwise they’re just like us…and not too happy to have an alien invader in their midst. Gary Oldman, Jessica Biel, Justin Long and John Cleese are also in the voice cast. Joe Stillman (Shrek and Shrek 2, the upcoming Gulliver’s Travels) is credited with the script and Jorge Blanco, Javier Abad and Marcos Martinezare co-directed. See the trailer after the jump.

Planet 51 isn’t quite a world just like ours — more like stereotypical ’50s America, only where the women walk little alien dogs. (By which I mean zenomorph, chestbursting dogs.) The dogs are the least of astronaut Chuck Baker’s problems, though, as he’s got only three days to get back to his command module in orbit above the planet before it heads back to Earth without him. Between him and his route up to space stands a general who isn’t willing to just let him get away.

For the six people who saw Battle For Terra, this might look fairly familiar. There’s none of Terra‘s ‘human invasion force’ plot (or so it seems) but there is a very similar human stranded on civilized alien world, little robot helper, young alien helping him get back to his ship, etc. But then, the idea of sticking a human astronaut on a world with a civilization that’s just as developed and slightly paranoid as ours isn’t exactly (ahem) rocket science. We’ll just disregard the fact that Battle For Terra is actually a couple years old (it showed up at TIFF in ’07) and accept the whole thing as coincidence, since Planet 51 has been in development for quite a while.